- #1

weeeee123

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## Homework Statement

First half of a trip is @ 10 MPH

Second half of a trip is @ 40 MPH

Avg velocity?

## Homework Equations

(Vi+Vf)/2 = avg velocity...?

## The Attempt at a Solution

K, this is obviously a simple question but for some reason when I do it I get it wrong, and I'm 100% sure I'm right. But I'm not. WTH?

I know the answer is 16, because the answer is given to me. I don't know how to get to there though for whatever reason. What I did was basically weight each velocity by multiplying each by .5 since each speed is for half the time. I get 25, which is wrong. Then I thought about it this way. If I go 10 MPH for half an hour, that's 5 miles. Then if I go 40 MPH for half an hour, that's 20 miles. In total I went 25 miles in one hour, and my avg velocity should be 25 in that case. What am I missing?